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Weighted cross-correlation based variational optical flow for gastric flow analysis in ultrasonic videos
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10.1118/1.4798978
/content/aapm/journal/medphys/40/5/10.1118/1.4798978
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4798978

Figures

Image of FIG. 1.
FIG. 1.

Illustration of the force balancing in calculating the optical flow. The estimated corresponding position is where the internal and external forces reach the balance.

Image of FIG. 2.
FIG. 2.

The flowchart of the proposed method.

Image of FIG. 3.
FIG. 3.

The simulation of ultrasonic images. (a) The echogenicity model, (b) the motion field, (c) the synthetic ultrasonic image of the first frame, (d) the synthetic ultrasonic image of the second frame.

Image of FIG. 4.
FIG. 4.

The synthetic motion fields. (a) An illustration of the motion field division. (b)–(f) Motion fields used to mimic cases where large-volume negative flow (reflux), large-volume positive flow, conflicting flow, opposite flow, and small-volume negative flow exists, respectively.

Image of FIG. 5.
FIG. 5.

Angular error results of (a) the proposed method, (b) Molnár's method, (c) Black's method, (d) Classic+NL in a synthetic ultrasonic image pair.

Image of FIG. 6.
FIG. 6.

Qualitative comparison in a real ultrasonic image pair. (a) Anatomy structural image, (b) color scale map, the motion magnitude and angle are encoded by saturation and hue respectively. (e) to (f) the motion fields of the proposed method, Molnár's method, Black's method, Classic+NL, respectively.

Image of FIG. 7.
FIG. 7.

Motion vectors of (a) the proposed method, (b) Molnár's method, (c) Black's method, (d) Classic+NL in the rectangle marked in Fig. 6(a) .

Image of FIG. 8.
FIG. 8.

Flow direction judgments of the automatic methods (cross) and visual observation (circle). 1 means positive flow, −1 means negative flow, and 0 means no conclusion is drawn.

Tables

Generic image for table
TABLE I.

The evaluation of the compared methods in synthetic ultrasonic images.

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/content/aapm/journal/medphys/40/5/10.1118/1.4798978
2013-04-04
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Weighted cross-correlation based variational optical flow for gastric flow analysis in ultrasonic videos
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4798978
10.1118/1.4798978
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